winforms - Producing a progress bar while loading in C# -

i have below code shows message text box while loading:

    private void button3_click_1(object sender, eventargs e)     {         int i;         backgroundworker bw = new backgroundworker();          bw.workerreportsprogress = true;         bw.workersupportscancellation = true;         bw.dowork += new doworkeventhandler(bw_dowork);         bw.progresschanged += new progresschangedeventhandler(bw_progresschanged);         bw.runworkercompleted += new runworkercompletedeventhandler(bw_runworkercompleted);          msgform = new form2();  //form2 showing message "please wait..."          try         {                 bw.runworkerasync(combobox15.text);                  msgform.startposition = formstartposition.centerparent;                 msgform.showdialog();         }         catch (exception ex)         {             messagebox.show(ex.message);         }     }       void bw_dowork(object sender, doworkeventargs e)     {         string prtadd = e.argument.tostring();          loading(prtadd); //this function of loading.     }      void bw_runworkercompleted(object sender, runworkercompletedeventargs e)     {         msgform.close();     } 

my loading takes 2-3 minutes. so, if show static message box, user think maybe program hang somewhere.

i improve adding progress bar while loading. can guys me?

something this, perhaps?

public partial class form1 : form {     private form2 _frm2;      public form1() {         initializecomponent();     }      private void button1_click(object sender, eventargs e)     {         var bw = new backgroundworker();         bw.workerreportsprogress = true;         bw.workersupportscancellation = true;         bw.dowork += bwondowork;         bw.runworkercompleted += bwonrunworkercompleted;         bw.runworkerasync();          _frm2 = new form2(bw);         _frm2.startposition = formstartposition.centerparent;         _frm2.showdialog();     }      private void bwonrunworkercompleted(object sender, runworkercompletedeventargs runworkercompletedeventargs)     {        if (_frm2 != null)        {            _frm2.close();        }     }      private void bwondowork(object sender, doworkeventargs doworkeventargs)     {         var bw = sender backgroundworker;         var = 0;         while (i < 100 && !bw.cancellationpending)         {             bw.reportprogress(i);             thread.sleep(100);             i++;         }     } }  public partial class form2 : form {     private backgroundworker _bw;      public form2() {         initializecomponent();     }      public form2(backgroundworker bw) : this()     {         _bw = bw;         _bw.progresschanged += bwonprogresschanged;     }      private void bwonprogresschanged(object sender, progresschangedeventargs progresschangedeventargs)     {         progressbar1.value = progresschangedeventargs.progresspercentage;     }      private void button1_click(object sender, eventargs e) {         _bw.cancelasync();     } }